veterinary drugs(not N) as additional to SN method

[emptybox]

I'm sorry in advance if this idea is too ridiculous for those who understand something in this topic,

I'm wondering if it could make sense to use medication that vets use as analgetic(or something), in order to "improve" the SN method experience(considering I can't get benzo).
In my country you can buy some legally without restrictions

Spoiler

(Zoletil, Xylanite)

. + there's no problem with administrating it intravenously or intramuscularly.

• 0.25 ml per 100 kg of animal weight – a slight sedative effect with a decrease in muscle tone and maintaining body position in space.
  Used to calm the animal.
• 0.5 ml per 100 kg of animal weight – moderate sedation, with a pronounced decrease in muscle tone (the animal, as a rule, maintains an upright position) and some analgesic effect. Used for clinical trials, minor surgical interventions, mainly in combination with local anesthesia.
• 1.0 ml per 100 kg of animal weight – pronounced sedation and a decrease in muscle tone (the animal lies down), a high degree of anesthesia. Used for long-term surgical interventions with the possible addition of local or general anesthesia.
• 1.5 ml per 100 kg of animal weight – deep sedation, with a complete decrease in muscle tone and a high degree of analgesia. It is used only in adult animals after a preliminary starvation diet during very painful and lengthy operations and during obstetrics.

Could reaching any of these be helpful? Or it's too complicated and better not to risk?
Thank you.

 

[Sunset Limited]

Z = Dissociative anesthetic such as ketamine.

X = Central A2 agonist. Sedative + analgesic. However, it is a very powerful emetic. It is used to induce vomiting of animals. Its counterpart, dexmedetomidine, is used for sedation in humans. The use of these drugs is complex.

Z can offer surgical depth of anesthesia as induction dose + infusion. If it's the same as ketamine. I don't know much about it.